The invention discloses a high-flexibility medium voltage cable for use in an offshore wind turbine bin. The high-flexibility medium voltage cable comprises conductive units, a control unit, a light unit, a shielding layer and an outer protecting bush layer, wherein taped covering layers (2), inner shielding layers (3), insulating layers (4), outer shielding layers (5) and metal shielding layers (6) are sequentially arranged outside copper conductors (1) of the conductive units; an insulating layer (8), a filling layer (11) and an inner protecting layer (9) are sequentially arranged outside acopper conductor (7) of the control unit, and the light unit (10) is located in the control unit; a filling layer (12) is located between the conductive units and the control unit; and a total shielding layer (13) and the outer protecting bush layer (14) are arranged outside the conductive units. According to the technical scheme, by utilizing a novel structure and materials, the cable has relatively high flexibility, wear resistance, acidity resistance, low temperature resistance and excellent shielding performance and integrates functions of power transmission, signal control and data transmission, so that the construction cost is lowered, and the cable is relatively applicable to offshore wind generation systems.